The Ultimate Guide to Citra AES Keys: Fix "Encrypted" Game Errors
: The file must be named exactly aes_keys.txt .
The file is a plain text file. The format is strict: one key per line, with the , an equals sign, and the hexadecimal key .
: ~/.local/share/citra-emu/sysdata or ~/.var/app/org.citra_emu.citra/data/citra-emu/sysdata macOS : ~/Library/Application Support/Citra/sysdata
The Last Key
You can also place it in the user folder within the Citra directory if using a portable build.